Method and apparatus for detecting arrhythmias in a subcutaneous medical device
First Claim
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1. A medical device for detecting a cardiac event and delivering a corresponding therapy, the device comprising:
- a plurality of electrodes configured to detect cardiac signals along a first sensing vector and a second sensing vector;
an energy storage device; and
a control unit configured to;
identify the cardiac event;
initiate charging of the energy storage device;
thensense a cardiac signal on each of the first sensing vector and the second sensing vector;
thendeliver a charge from the energy storage device upon a completion of charging of the energy storage device if the cardiac signal sensed by at least one of the first sensing vector and the second sensing vector during a predetermined look back sensing window having a start time and an ending time is indicative of the cardiac event, the ending time of the predetermined look back sensing window being based on and no later than a time of completion of the charging of the energy storage device.
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Abstract
A method and apparatus for detecting a cardiac event in a medical device that includes sensing cardiac signals from a plurality of electrodes, charging an energy storage device in response to the sensed cardiac signals, determining whether the charging of the energy storage device is completed, and determining whether the cardiac event is confirmed in response to an asynchronous look back.
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Citations
17 Claims
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1. A medical device for detecting a cardiac event and delivering a corresponding therapy, the device comprising:
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a plurality of electrodes configured to detect cardiac signals along a first sensing vector and a second sensing vector; an energy storage device; and a control unit configured to; identify the cardiac event; initiate charging of the energy storage device;
thensense a cardiac signal on each of the first sensing vector and the second sensing vector;
thendeliver a charge from the energy storage device upon a completion of charging of the energy storage device if the cardiac signal sensed by at least one of the first sensing vector and the second sensing vector during a predetermined look back sensing window having a start time and an ending time is indicative of the cardiac event, the ending time of the predetermined look back sensing window being based on and no later than a time of completion of the charging of the energy storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device for detecting a cardiac event and delivering a corresponding therapy, the device comprising:
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means for detecting cardiac signals from a plurality of electrodes forming a first sensing vector and a second sensing vector; an energy storage device; means for identifying the cardiac event; means for initiating charging of the energy storage device in response to identifying the cardiac event; means for sensing a cardiac signal on each of the first sensing vector and the second sensing vector after initiating charging of the energy storage device; means for delivering a charge from the energy storage device upon a completion of charging of the energy storage device if the cardiac signal sensed by at least one of the first sensing vector and the second sensing vector during a predetermined look back sensing window having a start time and a ending time is indicative of the cardiac event, the ending time of the predetermined look back sensing window being based on and no later than a time of completion of the charging of the energy storage device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification